I'd like real cards, too, but I don't know how you'd make them. There's way too much text on some cards, and the pictures are too big, unless they printed huge cards or had the text on the back.
It would be nice to be able to purchase real cards with activation codes, then put the code in online to get the card in the game as well. Or maybe package the printed cards with gran cards, so you get both? That way people can't guess individual card codes and rip you off, and it's like you're buying two booster packs or boxes in one.